A congressional investigation has found levels of arsenic, lead and other toxic metals that can harm brain development in many popular baby foods, including organic brands. In a report released Thursday, a U.S. House Subcommittee said it requested internal data from seven companies, including Walmart, in 2019 after a nonprofit called Healthy Babies Bright Futures published results of testing it did on baby foods. Four of the companies – Gerber, Beech-Nut, Earth's Best Organics maker Hain Celestial and Happy Family Organics maker Nurture Inc. – shared documents. The subcommittee said Walmart, Sprout Foods and Campbell Soup Co., which makes Plum Organics baby food, didn't cooperate. Arsenic, lead, cadmium and mercury – metals that the U.S. Food and Drug Administration considers harmful to human health – can remain in the environment for decades from past pesticide and herbicide use, according to Michael Hansen, a senior staff scientist with Consumer Reports. In a statement Thursday, the FDA said it takes exposure to toxic elements in the food supply very seriously.